Sorry to hear about your dad's condition. Stage 4 colon cancer
without chemo has a poor prognosis. The description of his condition also does not look very encouraging. There is very little doctors can do at this stage except for alleviate his pain. In such a condition, survival is usually not for very long (few days - few weeks) but the exact prognosis can only be explained by the treating doctor who is assessing his condition every day.